11
V
CC1
(+5 V)
619 Ω
D.U.T.
V
CC
4.02 KΩ
DATA
INPUT
TTL OR
LSTTL
GND
OPEN
COLLECTOR
GATE
Figure 12. Series LED Drive with Open Collector Gate
(4.02 kΩ Resistor Shunts IOH from the LED).
V
CC2
(+5 V)
DATA
OUTPUT
V
CC1
(+5 V)
UP TO 16 LSTTL
LOADS
665 Ω
665 Ω
D.U.T.
OR 4 TTL LOADS
V
CC
0.1
µF
DATA
INPUT
TTL OR
LSTTL
DATA
OUTPUT
DATA
INPUT
TTL OR
LSTTL
TOTEM
POLE
GND
OUTPUT
GATE
1
TOTEM
POLE
OUTPUT
GATE
UP TO 16 LSTTL
LOADS
OR 4 TTL LOADS
1
2
Figure 13. Recommended LSTTL to LSTTL Circuit.
V
+ 20 V
CC
D.U.T.*
V
CC
I
F
I
O
0.01 µF
+
–
1200 Ω
V
E
V
IN
1.90 V
100 Ω
GND
CONDITIONS: I = 8 mA
F
I
= -14 mA
O
T
= +125 °C
A
*ALL CHANNELS TESTED SIMULTANEOUSLY.
Figure 14. Single Channel Operating Circuit for Burn-in and Steady State Life Tests.
HP [ HEWLETT-PACKARD ]
